They were talking about a fall 2017 transplant but that did not happen. They are still saying it is imminent.
They have been worked on experiments with mice, dogs, and monkeys.
In November 2017, they transplanted a human head between two human cadavers.
There have been delays of months and years but they have funded surgical teams and have dedicated many years making progress to this goal. It seems clear that they believe that they can make this procedure successful, where the patient would survive for many months and possibly years and that the patient would be able to regain useful functions.